Abstract:Cov txiaj ntsig ntawm cov ntsiab lus sib txawv ntawm hydroxypropyl methylcellulose ether ntawm cov khoom ntawm cov khoom siv sib xyaw qhuav plastering mortar tau kawm. Cov txiaj ntsig tau pom tias: nrog kev nce ntawm cov ntsiab lus ntawm cellulose ether, qhov sib xws thiab qhov ntom ntom tau txo, thiab lub sijhawm teeb tsa tau txo qis. Qhov txuas ntxiv, 7d thiab 28d compressive zog poob qis, tab sis tag nrho cov kev ua tau zoo ntawm cov tshuaj khib nyiab qhuav tau raug txhim kho.
0. Cov lus qhia
Hauv xyoo 2007, rau lub luag haujlwm thiab cov thawj coj hauv lub tebchaws tau tshaj tawm "Daim Ntawv Ceeb Toom Txog Kev Tiv Thaiv On-Site Mixing of Mortar hauv Qee Lub Nroog nyob rau lub sijhawm txwv". Tam sim no, 127 lub nroog thoob plaws lub tebchaws tau ua haujlwm ntawm "kev txwv tsis pub muaj" mortar, uas tau coj txoj kev loj hlob tsis tau muaj dua los rau kev tsim cov tshuaj khib nyiab qhuav. lub sijhawm. Nrog rau txoj kev loj hlob ntawm cov tshuaj khib nyiab qhuav hauv kev lag luam hauv tsev thiab txawv teb chaws, ntau yam khoom siv khib nyiab qhuav tau nkag mus rau qhov kev lag luam tawm tshiab no, tab sis qee cov tshuaj khib nyiab ntau lawm thiab cov tuam txhab muag muag txhob txwm tshaj tawm qhov ua tau zoo ntawm lawv cov khoom, ua rau cov khoom qhuav qhuav. mix mortar kev lag luam. noj qab nyob zoo thiab kev loj hlob. Tam sim no, zoo li cov khoom sib xyaw ua ke, cov khoom siv khib nyiab qhuav qhuav yog siv los ua ke, thiab qee qhov siv ib leeg. Hauv particular, muaj ntau ntau hom admixtures nyob rau hauv ib co kev ua hauj lwm qhuav-siv mortars, tab sis nyob rau hauv zoo tib yam qhuav-mixed mortar, tsis muaj yuav tsum tau mus nrhiav tus naj npawb ntawm admixtures, tab sis ntau mloog yuav tsum tau them rau nws practicability thiab operability. zam kev siv cov tshuaj khib nyiab ntau dhau, ua rau cov khoom pov tseg tsis tsim nyog, thiab tseem cuam tshuam rau qhov zoo ntawm qhov project. Hauv cov tshuaj khib nyiab qhuav sib xyaw, cellulose ether plays lub luag haujlwm ntawm kev tuav dej, thickening, thiab txhim kho kev tsim kho kev ua haujlwm. Kev tuav dej zoo ua kom ntseeg tau tias cov tshuaj khib nyiab qhuav yuav tsis ua rau cov xuab zeb, hmoov av thiab lub zog txo vim dej tsis txaus thiab tsis tiav cov cement hydration; cov nyhuv thickening zoo heev txhim kho lub zog ntawm cov mortar ntub dej. Daim ntawv no ua ib txoj kev tshawb fawb txog kev siv cellulose ether hauv cov tshuaj khib nyiab qhuav sib xyaw, uas muaj cov lus qhia tseem ceeb rau kev siv cov khoom sib xyaw kom zoo hauv cov tshuaj khib nyiab qhuav.
1. Cov ntaub ntawv raw thiab cov txheej txheem siv hauv kev sim
1.1 Cov ntaub ntawv raw rau kev xeem
Cov cement yog P. 042.5 xis mas, ya tshauv yog Class II tshauv los ntawm ib lub fais fab nroj tsuag nyob rau hauv Taiyuan, cov nplua aggregate yog qhuav dej xuab zeb nrog ib tug loj ntawm 5 hli los yog ntau sieved, lub fineness modulus yog 2.6, thiab cov cellulose ether yog lag luam muaj hydroxypropyl methyl cellulose ether (viscosity 12000 MPa·s).
1.2 Test method
Cov qauv kev npaj thiab kev ntsuas kev ua tau zoo tau ua raws li JCJ / T 70-2009 cov qauv kev sim ua haujlwm ntawm lub tsev mortar.
2. Kev npaj xeem
2.1 Formula rau kev xeem
Hauv qhov kev sim no, tus nqi ntawm txhua cov khoom siv raw ntawm 1 tuj qhuav-sib xyaw plastering mortar yog siv los ua cov qauv yooj yim rau kev sim, thiab cov dej yog cov dej siv ntawm 1 tuj qhuav-siv mortar.
2.2 Cov phiaj xwm tshwj xeeb
Siv cov qauv no, tus nqi ntawm hydroxypropyl methylcellulose ether ntxiv rau txhua tuj ntawm cov khoom sib xyaw qhuav plastering mortar yog: 0.0 kg / t, 0.1 kg / t, 0.2 kg / t, 0.3 kg / t, 0.4 kg / tt, 0.6 kg / t, los kawm txog cov teebmeem ntawm ntau npaum li cas ntawm hydroxypropyl methylcellulose ether ntawm cov dej tuav, Kev sib piv, pom tseeb, teeb tsa lub sijhawm, thiab kev sib xyaw ua ke ntawm cov tshuaj khib nyiab kom qhuav, ua kom zoo dua qub ntawm cov txheej txheem sib xyaw yooj yim, kev tsim kho yooj yim, kev tiv thaiv ib puag ncig thiab txuag hluav taws xob.
3. Cov txiaj ntsig thiab kev tshuaj xyuas
3.1 Cov qhab nia xeem
Qhov cuam tshuam ntawm kev sib txawv ntawm hydroxypropyf methylpcellulose ethers, teeb tsa lub sijhawm, thiab compressive lub zog ntawm dog dig plastering cug.
3.2 Kev txheeb xyuas cov txiaj ntsig
Nws tuaj yeem pom ntawm cov txiaj ntsig ntawm kev sib txawv ntawm hydroxypropylulphelyleculose, teeb tsa lub sijhawm, thiab compressive lub zog ntawm dog dig plastering cug. Nrog rau qhov nce ntawm cellulose ether cov ntsiab lus, cov dej tuav tus nqi ntawm cov mortar ntub tseem yog maj mam nce, los ntawm 86.2% thaum hydroxypropyl methyl cellulose tsis tov, mus rau 0.6% thaum hydroxypropyl methyl cellulose yog tov. Cov dej tuav tus nqi nce mus txog 96.3%, uas ua pov thawj tias cov dej tuav cov nyhuv ntawm propyl methyl cellulose ether zoo heev; qhov sib xws maj mam txo qis nyob rau hauv cov dej tuav cov nyhuv ntawm propyl methyl cellulose ether (cov dej haus ib tuj ntawm mortar tseem tsis hloov thaum lub sij hawm sim); Qhov ntom ntom pom tau hais tias qhov kev poob qis, qhia tau hais tias cov dej tuav cov nyhuv ntawm propyl methyl cellulose ether ua rau kom cov ntim ntub dej thiab txo qhov ntom ntom; Lub sijhawm teeb tsa maj mam ncua nrog qhov nce ntawm cov ntsiab lus ntawm hydroxypropyl methyl cellulose ether, thiab cov ntsiab lus ntawm Thaum nws nce mus txog 0.4%, nws txawm tias tshaj li tus nqi teev tseg ntawm 8h yuav tsum tau ua los ntawm tus qauv, qhia tias qhov tsim nyog siv hydroxypropyl methylcellulose ether muaj. ib tug zoo regulating nyhuv ntawm lub sij hawm operability ntawm ntub mortar; lub zog compressive ntawm 7d thiab 28d tau txo qis (Qhov ntau npaum li cas, qhov pom tseeb qhov txo qis). Qhov no muaj feem xyuam rau qhov nce ntawm qhov ntim ntawm cov mortar thiab qhov txo qis ntawm qhov pom tseeb. Qhov sib ntxiv ntawm hydroxypropyl methyl cellulose ether tuaj yeem tsim cov kab noj hniav kaw hauv cov mortar hardened thaum lub sij hawm teeb tsa thiab hardening ntawm mortar. Micropores txhim kho lub durability ntawm mortar.
4. Kev ceev faj rau daim ntawv thov ntawm cellulose ether nyob rau hauv zoo tib yam qhuav-mixed mortar
1) Kev xaiv cov khoom siv cellulose ether. Feem ntau hais lus, qhov ntau dua qhov viscosity ntawm cellulose ether, nws cov dej tuav tau zoo dua, tab sis qhov siab dua qhov viscosity, nws cov solubility qis dua, uas ua rau muaj kev puas tsuaj rau lub zog thiab kev tsim kho ntawm mortar; lub fineness ntawm cellulose ether yog kuj tsawg nyob rau hauv qhuav-mixed mortar. Nws yog hais tias qhov finer nws yog, qhov yooj yim nws yog yaj. Nyob rau hauv tib qhov ntau npaum li cas, lub finer lub fineness, qhov zoo dua cov dej tuav nyhuv.
2) Kev xaiv ntawm cellulose ether ntau npaum. Los ntawm kev ntsuam xyuas cov txiaj ntsig thiab kev tshuaj xyuas cov txiaj ntsig ntawm cov ntsiab lus ntawm cellulose ether ntawm kev ua tau zoo ntawm cov khoom siv qhuav-mixed plastering mortar, nws tuaj yeem pom tias ntau dua cov ntsiab lus ntawm cellulose ether, qhov zoo dua, nws yuav tsum tau txiav txim siab los ntawm cov nqi tsim khoom, khoom zoo, kev tsim kho kev ua tau zoo thiab Plaub yam ntawm kev tsim kho ib puag ncig kom nkag siab xaiv qhov tsim nyog npaum li cas. Qhov ntau npaum li cas ntawm hydroxypropyl methyl cellulose ether nyob rau hauv cov tshuaj khib sib xyaw qhuav yog qhov zoo dua 0.1 kg / t-0.3 kg / t, thiab cov nyhuv tuav dej tsis tuaj yeem ua tau raws li tus qauv yuav tsum tau yog tias cov nyiaj hydroxypropyl methyl cellulose ether ntxiv rau me me. Kev raug mob zoo; Qhov ntau npaum ntawm hydroxypropyl methyl cellulose ether nyob rau hauv tshwj xeeb tawg-resistant plastering mortar yog hais txog 3 kg / t.
3) Daim ntawv thov ntawm cellulose ether nyob rau hauv zoo tib yam qhuav-mixed mortar. Nyob rau hauv tus txheej txheem ntawm kev npaj ib tug zoo tib yam qhuav-mixed mortar, ib tug tsim nyog tus nqi ntawm admixture yuav muab ntxiv, nyiam dua nrog ib tug tej yam dej tuav thiab thickening nyhuv, thiaj li hais tias nws muaj peev xwm tsim ib tug composite superposition nyhuv nrog cellulose ether, txo cov nqi ntau lawm, thiab txuag cov peev txheej. ; Yog tias siv ib leeg Rau cellulose ether, lub zog sib txuas tsis tuaj yeem ua tau raws li qhov yuav tsum tau ua, thiab qhov tsim nyog ntawm cov hmoov latex tuaj yeem ntxiv; vim qhov tsawg ntawm cov tshuaj mortar admixture, qhov ntsuas qhov yuam kev yog loj thaum siv ib leeg. Qhov zoo ntawm cov khoom siv khib nyiab qhuav.
5. Cov lus xaus thiab cov lus qhia
1) Nyob rau hauv cov ntaub ntawv qhuav-sib xyaw plastering mortar, nrog rau kev nce ntawm cov ntsiab lus ntawm hydroxypropyl methylcellulose ether, cov dej tuav tus nqi tuaj yeem ncav cuag 96.3%, qhov sib xws thiab ntom yog txo, thiab lub sijhawm teem sijhawm ntev. Lub zog compressive ntawm 28d txo qis, tab sis tag nrho cov kev ua tau zoo ntawm cov tshuaj khib nyiab qhuav tau txhim kho thaum cov ntsiab lus ntawm hydroxypropyl methyl cellulose ether yog nruab nrab.
2) Nyob rau hauv tus txheej txheem ntawm kev npaj cov khoom sib xyaw qhuav qhuav, cellulose ether nrog cov viscosity thiab fineness yuav tsum raug xaiv, thiab nws cov koob tshuaj yuav tsum tau txiav txim siab los ntawm kev sim. Vim tias qhov tsawg ntawm cov tshuaj mortar admixture, qhov ntsuas qhov yuam kev yog qhov loj thaum siv ib leeg. Nws raug nquahu kom sib tov nws nrog cov cab kuj ua ntej, thiab tom qab ntawd ntxiv cov khoom ntxiv kom ntseeg tau tias cov khoom siv tshuaj khib nyiab qhuav qhuav.
3) Dry-mixed mortar yog ib qho kev lag luam tawm hauv Suav teb. Nyob rau hauv cov txheej txheem ntawm kev siv cov tshuaj khib nyiab, peb yuav tsum tsis txhob ua qhov muag tsis pom qhov ntau, tab sis ua tib zoo saib xyuas kom zoo thiab txo cov nqi tsim khoom, txhawb kev siv cov khoom siv pov tseg, thiab ua tiav kev txuag hluav taws xob thiab kev txo qis.
Post lub sij hawm: Feb-22-2023